package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    private static final String WEIXIN_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
    private static final String APP_ID = "appid";
    private static final String SECRET = "secret";
    private static final String JS_CODE = "js_code";
    private static final String GRANT_TYPE = "grant_type";
    private static final String AUTHORIZATION_CODE = "authorization_code";
    private static final String OPEN_ID = "openid";

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WeChatProperties weChatProperties;

    /**
     * 微信登录
     *
     * @param userLoginDTO
     * @return
     */
    public User login(UserLoginDTO userLoginDTO) {
        // 调用微信接口服务，获取微信用户的openid
        String openid = getOpenid(userLoginDTO.getCode());

        //判断openid是否为空
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断当前用户是否为新用户
        User user = userMapper.getByOpenId(openid);
        //如果是新用户 完成自动注册
        if (user == null) {
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }

        //返回这个用户对象
        return user;
    }

    /**
     * 调用微信接口服务，获取微信用户的openid
     * @param code
     * @return
     */
    public String getOpenid(String code){
        Map<String, String> paramMap = new HashMap<>();
        paramMap.put(APP_ID, weChatProperties.getAppid());
        paramMap.put(SECRET, weChatProperties.getSecret());
        paramMap.put(JS_CODE, code);
        paramMap.put(GRANT_TYPE, AUTHORIZATION_CODE);
        String getResult = HttpClientUtil.doGet(WEIXIN_LOGIN, paramMap);
        JSONObject jsonObject = JSON.parseObject(getResult);
        String openid = (String) jsonObject.get(OPEN_ID);
        return openid;
    }

}
